Engine piston



l. BEUC.

ENGHIE PlSON.

APPLICANON man FEB.

2 SHEETS-SHEET l.

filma L'BEUC.

ENGINE PISTON APPLIlcAnoN FILED FEB.1.1921.

mme@ Feb, EL w22.

2 SHEETS-SHEET 2.

[HQI/envan l l Uco 56M.

" Wag@ lll] saints.' m en JACOB BEUVQF ST. LUES, MISSOUR.

ENGINE ESTN.

i Application filed February ments in pistons forA engines, particularly internal combustion engines and consists in the novel features ot' construction more fully set forth in the speciiication and pointed vout in the claims. The principal object'o'i the present invention is to provide a piston that is composed of separable parts whereby the piston shell embodying the skirt of the piston may be readily removed from the c ylinder without disconnecting the cpnnecting rod. in pistons of the ordinary construction it is necessary to 'remove the piston through the crank case when it is desired to fit the piston with new rings, thus lentailing a great amount of labor to accomplish a comparan tively small task. In a piston of my improved construction, ir" for any purpose 1tis desirable to remove the same from the cylinder, the shell is merely uncoupled from the connecting rod through the top ot the cylinder', after 'which it may be readily slipped out of the cylinder. A further object is to provide a piston wl'ierein the connecting rod and the wrist pin are integrally formed, the latter being trunnioned entirely Iwithin the piston, thereby preventing the Hnger of the cylinder walls being scored by contact with the wrist pin. A further object is to provide a piston that shall have adjustable bearings for the wrist pin wherein the play due to wear may be periodically taken up', thus preventing a piston knock Afrom developingr at this point. A further object yof the invention is the provision of a composite piston that is durable, comparatively light in weight, and that may be vcheaply manufactured.y Further and other advantages will be better apparent from a detailed description of the invention in connection with the accompanying drawings in which- -Figure 1 is a top plan of my improved piston; Fig@ is a middle vertical longitudinal section on the line4 2, 2 .of Fig. 1 with part of the connecting rcil trunnion in ele- Specification of Letters Patent. Patented Feb,

el., 1922i serial no. 443,152.

ration; Fig.- 3 is plan view of the piston shell; Fig. l is a combined side elevation and middle longitudinal section on the line li, fi of Fig. 3; Fig. 5 is a plan view of the locking head t'or the trunnion bearings; Fig 6 is a combined side elevation and section on l the line 6, 6 of Fig. 5; Fig. 7 is a plan view oi' the upper trunnion bearing; Fig. 8 is a combined side elevation and section on the line 8,8 of Fig. 7; and Fig. 9 is a side-elevation of the upper trunnion bearing with the same turned 90 degrees from the position shown in Fig. 8.

Referring to the drawings more particuvlarly 1 represents the piston shell provided with the usual ring grooves 2 on its periphery. The shell 1 has a pair of oppositely disposed bearing brackets 3 projecting from the inside of the shell wall, and the brackets are formed with substantially semi-circuiar seats 4 for the reception ot a hollow trun-` nion 5 vcast integrally with the connecting rod 6. The trunnions 5, 5 as will presently appear,- serve the purpose of the customary piston wrist pin. An upper bearing or cap 7 is adapted to fit over the trunnions 5, 5, the .bottom wall w of the cap being spaced a slightdistanceifrom the upper edge ot' the bearing' seat 4, and oppositely disposed ribs 4 projecting laterally from each side of the seats 4.. rihe wall w is provided with four openings a, and the ribs 4 are 'each provided with a threaded opening'a, said openings a and a being in register when the cap 7 is V properly positioned over the trunnions 5, 5. Cap screws b are passed through the openings a in the wall ic, and screw 'seated into the openings a', thereby binding the cap 7 securely against the trunnions 5, 5. Of course, the pressure with which. thegcap bears against the trunnions may be regulated by merely rscrewing or unscrewing the cap screws b. The shell 1 is provided with. an internally threaded portion l ot slightly smaller diameter than the slrirt of the shell, and a threaded plug 8, Which-may be called the piston head, is adapted to' be screwed intothe threaded portion 1 ot the shell, the head 8 on being screwed home coming into engagement with an annular flange 7 projecti ,g upwardly from the cap 7, and an annularly stepped boss 7 on the cap 7. After the head 8 has been brought to its home position in Contact with the cap 7, a stud 9 is passed through van axial opening o in the head 8 and screw seated into a threaded opening o in the boss 7". The head of the stud 9 is countersunk into the head 8 and provided with an aperture 10 through'which a Cotter pin 11 may be inserted with its extremities positioned in notches 12, 12 formed in the head 8, whereby the screw 9 is effectively .locked in place. N

If at any time it is desired to remove the piston from the engine cylinder, the cotter pm l1 is removed, after which the stud '9 come opposite the passage P between `the brackets 3, thus permitting the shell toghe passed upwardly out of 'the cylinder, the trunnions passing through the passage P as the shell is removed. It will be apparentv that as the trunnions become loose in the bearings 3 and 7 through Wear, the play may be taken up from time to time by merely tightening the cap screws b. Preferably the threads on the head 8 are right hand threads, .While the threads on the stud 9 are left hand threads, so that when th(` stud isl locked to the head by the cott'er pin 1l it will be impossible for'tbe head 8 to become unscrewed, because the stud Will act as a lock to prevent rotation of the head 8; in other Words, the stud 9 must be removed before' the head 8 can be unscrewed.

From the foregoing itwill be apparent that I have provided a piston readily removwhole,

able from the cylinder of the engine withouttaking -thehllatter apart, and although the piston isfbuilt up of partsinto a composite the parts are securely locked together when the piston is assembled so that vibrations or knocks inthe piston are practically impossible. The invention is obviously susceptibletomodifications, and I `Wish to avail the shell l., and the latter may be lifted myself of all modilied forms the spirit of the invention;A

Having described my invention, I claim l. A 'builtsup composite piston comprising an outer shell open at the top, bosses Within the shell for receiving a connecting rod, means insertable through said open top for holding theconnecting rod in place, and a piston head adapted to be'secured into the open top of the shell and close thesame.

falling Within A 2. In combination with an engine connectlng rod having trunnions on one end, an engine piston comprising a shell provided with a pair of'bearings in opposite spacedapart relation, said bearings being'adapted to re-v ceive the trunnions of the connecting rod, a hearing cap positioned over the trunnions, means insertable through the top of the shell for holding said cap in place, and means for adjusting the pressure of the cap on the trunnions. I

3. In combination with a built-11p com'- posite piston comprising an outer shell, and

brackets formed on the inner Wall of said -shell, said brackets having4 semi-circular4 seats, a connecting rod having trunnions at one end, said trunnions being adapted to rest in thebracket seats, a capypositioned oyer the trunnions, a piston-headv Screw-seated in the upper part of the shell land adapted to bear against the cap, anda "loclnstud traversing the head and screw-seated in said cap.

4. A built-up composite piston comprising an outer shel open at the top, bosses WithinV the shell for receiving a connecting rod,

means insertable' through said open top for holding the connecting rod in place,a-piston head adapted to be secured into the open. top otl the shell and close the same,.and means for locking said head to the shell.

A built-up composite piston comprising an outer shell open at the top, bosses Within.,

the shell for receiving a connecting rod, a bearing cap insertable through said open top and positioned over the connecting rod, a piston head adapted to be screw-seated in said open top and close the same,'and a lockstud traversing the head and screw-seated in the cap.

ln testimony whereof afiix my signature.

' JACOB BEUC. l 

